単

Abbreviation; Electricity, elec. eng.

single-phase alternating current

Biology

haploid phase (of an organism, cell, etc.); haplophase

Finance

simple interest

unlined sash

Philosophy

monad

Chemistry

single bond

single crop

single yarn (in spinning)

Chemistry

monosaccharides

monadism

Slang

(being a) fan of a single member of a music group (esp. idol group)

Mathematics

monomial (expression)

monochrome picture

unlined kimono worn as an undergarment by court nobles

Abbreviation; Grammar

third person singular present

Chemistry

monosaccharide

worker who only does one task; single skill worker

simple phrase

Botany

monocotyledon; monocot

simplicity and complexity; singular and plural; single and double; singles and doubles (in tennis)

Mahjong

waiting for one tile to finish one's pair and one's hand while the rest of one's hand is exposed; waiting for half of one's pair with four melds exposed

Mathematics

simply-connected

monosyllabic

first or solo run in a race (grand prix, horse race, etc.)

single authorship (of a book, paper, etc.); single-author work